PIC17C7XX Datasheet, PDF (262/328 Pages) Microchip Technology – High-Performance 8-Bit CMOS EPROM Microcontrollers with 10-bit A/D

PIC17C7XX
FIGURE 20-20: MEMORY INTERFACE WRITE TIMING
Q1
Q2
Q3
OSC1
ALE
OE
WR
AD<15:0>
151
150
addr out
152
Q4
Q1
154
data out
153
Q2
addr out
TABLE 20-21: MEMORY INTERFACE WRITE REQUIREMENTS
Param.
No. Sym
Characteristic
Min
Typ†
Max Units Conditions
150 TadV2alL AD<15:0> (address) valid to PIC17CXXX 0.25TCY - 10
—
ALE↓ (address setup time) PIC17LCXXX 0.25TCY - 10*
—
151 ^{TalL2adI ALE↓ to address out invalid PIC17CXXX}
0
—
(address hold time)
PIC17LCXXX
0*
—
—
ns
—
—
ns
—
152 TadV2wrL Data out valid to WR↓
(data setup time)
PIC17CXXX 0.25TCY - 40
—
PIC17LCXXX 0.25TCY - 40*
—
—
ns
—
153 TwrH2adI WR↑ to data out invalid
PIC17CXXX
—
0.25TCY§ —
ns
(data hold time)
PIC17LCXXX
—
0.25TCY§ —
154 TwrL
WR pulse width
PIC17CXXX
—
0.25TCY§ —
ns
PIC17LCXXX
—
0.25TCY§ —
*
These parameters are characterized but not tested.
†
Data in “Typ” column is at 5V, 25°C unless otherwise stated. These parameters are for design guidance only and are not
tested.
§
This specification ensured by design.
DS30289A-page 262
Preliminary
© 1998 Microchip Technology Inc.